[ruby-core:114920] [Ruby master Feature#19904] Deprecate or warn on multiple regular expression encodings

Issue #19904 has been updated by nobu (Nobuyoshi Nakada).


lol
```ruby
  it "selects last of multiple encoding specifiers" do
    /foo/ensuensuens.should == /foo/s
  end
```

----------------------------------------
Feature #19904: Deprecate or warn on multiple regular expression encodings
https://bugs.ruby-lang.org/issues/19904#change-104788

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
----------------------------------------
It seems like you can pass multiple encoding flags to regular expression literals, but I think this should be a warning or possibly syntax error.

For example:

```ruby
x = /foo/nu

p x.encoding
```

`n` says the RE should be ASCII-8BIT, and `u` says it should be UTF-8.  The last flag wins, so in this case the regular expression gets UTF-8 encoding.  However, I think it should be a warning or even a syntax error if you specify multiple encoding options on a regular expression.  It seems like a mistake if programmers specify multiple.

Thanks!



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